CN115413303A - Interleaving paper for glass plate and method for inhibiting generation of paper powder on interleaving paper for glass plate - Google Patents

Interleaving paper for glass plate and method for inhibiting generation of paper powder on interleaving paper for glass plate Download PDF

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Publication number
CN115413303A
CN115413303A CN202280003232.5A CN202280003232A CN115413303A CN 115413303 A CN115413303 A CN 115413303A CN 202280003232 A CN202280003232 A CN 202280003232A CN 115413303 A CN115413303 A CN 115413303A
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China
Prior art keywords
paper
glass
interleaving paper
interleaving
pulp
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Granted
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CN202280003232.5A
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Chinese (zh)
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CN115413303B (en
Inventor
井上慧
林寿大
野田沙织
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Tokushu Tokai Paper Co Ltd
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Tokushu Tokai Paper Co Ltd
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D57/00—Internal frames or supports for flexible articles, e.g. stiffeners; Separators for articles packaged in stacks or groups, e.g. for preventing adhesion of sticky articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/48—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
    • C03B40/02—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it by lubrication; Use of materials as release or lubricating compositions
    • C03B40/033—Means for preventing adhesion between glass and glass
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Packaging Frangible Articles (AREA)
  • Buffer Packaging (AREA)
  • Paper (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Laminated Bodies (AREA)

Abstract

The present invention relates to a specific breaking strength of 1.4kPa · m as defined in JIS P8112 2 A backing paper for glass plates having a specific breaking strength of 1.4kPa · m, which is defined in JIS P8112, the backing paper for glass plates being not less than g 2 A method for producing paper powder on the lining paper for glass plate above. The invention can provide an interleaving paper for glass plate capable of well inhibiting paper dust generation, and a method for well inhibiting paper dust generation of the interleaving paper for glass plateThe method is carried out.

Description

Interleaving paper for glass plate and method for inhibiting generation of paper powder on interleaving paper for glass plate
Technical Field
The present invention relates to a paper for packaging glass plates, a paper sandwiched between glass plates, and a paper powder generation inhibitor for the paper, in the course of stacking and storing and transporting a plurality of glass plates for flat panel displays such as liquid crystal displays, plasma displays, and organic electroluminescence (organic EL) displays.
Background
Generally, in a process of stacking and storing a plurality of glass plates for flat panel displays such as liquid crystal displays, plasma displays, and organic EL displays, or a process of carrying the glass plates by a truck or the like, the glass plates are brought into contact with each other by impact to cause scratches, and a paper called an interleaf paper is sandwiched between the glass plates in order to prevent contamination of the glass surfaces.
Such a glass plate for a flat panel display is required to have a clean surface as free from contamination as possible because an extremely minute circuit or the like is formed on the surface thereof unlike a general window glass plate for buildings, a window glass plate for vehicles, or the like. Therefore, the interleaving paper in contact with the glass surface also requires very high cleanliness.
In recent years, it has been recognized that paper dust generated from glass interleaving paper is one of the contaminants on the glass surface, and patent document 1 proposes that the freeness of pulp used for manufacturing interleaving paper be within a specific range in order to suppress the generation of paper dust.
[ Prior art documents ]
[ patent literature ] A
Patent document 1: japanese patent laid-open No. 2007-131965.
However, even such a mount does not satisfactorily suppress the generation of paper dust.
Disclosure of Invention
The invention aims to provide a lining paper for a glass plate, which can well inhibit paper dust from generating, and a method for well inhibiting the paper dust from generating in the lining paper for the glass plate.
In the present invention, the specific breaking strength of the interleaving paper for glass plates, which is defined in JIS P8112, is set to 1.4kPa · m 2 And/g or more, generation of paper dust in the interleaving paper for glass plates can be suppressed.
The first aspect of the present invention relates to a specific breaking strength of 1.4kPa · m as defined in JIS P8112 2 A slip sheet for glass plate of not less than g.
The interleaving paper for glass sheets of the first aspect of the present invention is preferably made of wood pulp. The wood pulp is preferably free of waste paper pulp.
The interleaving paper for glass sheets of the first aspect of the present invention is preferably a single layer.
The glass plate using the interleaving paper for glass plates of the first aspect of the present invention is preferably used for a display, preferably a TFT liquid crystal display or an organic EL display. The color filter may be formed on a surface of the glass plate.
A second aspect of the present invention relates to a method for suppressing the setting of the specific breaking strength of a slip sheet for glass sheets to 1.4kPa · m as defined in JIS P8112 2 A method for producing paper powder on the lining paper for glass plates of more than g.
The interleaving paper for glass sheets in the second aspect of the present invention is preferably made of wood pulp. The wood pulp is preferably free of waste paper pulp.
The interleaving paper for glass sheets in the second aspect of the present invention is preferably a single layer.
The glass plate using the interleaving paper for glass plates in the second aspect of the present invention is preferably used for a display, preferably a TFT liquid crystal display or an organic EL display. The color filter may be formed on a surface of the glass plate.
According to the present invention, the generation of paper dust in the interleaving paper for glass sheets can be favorably suppressed.
In the present invention, since the generation of paper dust in the interleaving paper for glass sheets can be favorably suppressed, the interleaving paper for glass sheets of the present invention is suitable as an interleaving paper for glass sheets which is required to have high cleanliness, and particularly suitable as an interleaving paper for glass sheets for liquid crystal displays or organic EL displays.
Detailed Description
As a result of intensive studies on the cause of generation of paper dust in the interleaving paper for glass sheets, the present inventors have found that, in a paper feeding operation in which interleaving paper is inserted between glass sheets, paper dust is generated on the surface of the paper due to external forces of various rollers and the like used in the paper feeding operation.
Further, as a result of intensive studies on the external force action on the interleaving paper for glass sheets, it was found that the specific breaking strength of the interleaving paper for glass sheets is critical with respect to the generation of paper dust,
that is, the relationship between the specific rupture strength of the interleaving paper for glass plates and the generation of paper dust has not been recognized so far, but as a result of further intensive studies, it has been found that the specific rupture strength of the interleaving paper for glass plates and the generation of paper dust are inversely related. The present inventors set the specific breaking strength of the interleaving paper for glass sheets to 1.4kPa · m as specified in JIS P8112 2 (ii) at least one of the above-mentioned amounts is capable of satisfactorily suppressing the generation of paper dust, and the present invention has been completed.
The lining paper for glass plates of the present invention has a specific breaking strength of 1.4kPa · m as defined in JIS P8112 2 A pressure of 1.9kPa · m or more, preferably 2 A value of at least/g, more preferably at least 2.6kPa · m 2 More preferably at least 3.2kPa · m 2 More than g.
The specific breaking strength is defined in JIS P8112 and is the breaking strength (kPa unit) divided by the gram weight (g/m) measured by the method in JIS P8124 2 Units) of the value.
The breaking strength is also defined by JIS P8112 and is a strength when the paper is broken by applying pressure to the paper using a fluid.
According to JIS P8111, a test object paper for a breaking strength test of JIS P8112 was placed in a standard state at a temperature of 23. + -. 1 ℃ and a relative humidity of 50. + -. 2%. The test is carried out 10 times each for the inside and outside, and the average value is the specific rupture strength.
In the measurement of the breaking strength, since a pressure is applied in a direction perpendicular to the paper surface, the breaking strength and the specific breaking strength reflect the strength in the thickness direction of the paper. The breaking strength and the specific breaking strength are different from the tensile strength and the tear strength which are not the strength in the thickness direction of the paper. Similarly, the fracture strength and the specific fracture strength are also different from the surface strength which represents only the two-dimensional strength of the surface layer of the paper surface.
The interleaving paper for glass sheets of the present invention is preferably made of wood pulp. Wood pulp is composed primarily of cellulose fibers. That is, the interleaving paper for glass sheets of the present invention is preferably composed of cellulose fibers.
As the wood pulp which can be used as a raw material of the interleaving paper for glass sheets of the present invention, wood pulp such as Needle Bleached Kraft Pulp (NBKP), leaf Bleached Kraft Pulp (LBKP), needle Bleached Sulfite Pulp (NBSP), leaf Bleached Sulfite Pulp (LBSP), thermomechanical pulp (TMP) and the like are preferable, alone or in combination.
The specific breaking strength of the interleaving paper for glass sheets of the present invention is 1.4kPa · m in order to provide JIS P8112 2 Preferably, the raw wood pulp is mainly softwood pulp and/or the raw wood pulp is restricted from hardwood pulp. The strength of the slip sheet for glass sheets of the present invention in the direction perpendicular to the paper surface can be increased by mainly using softwood pulp and/or by restricting the use of hardwood pulp.
Further, the specific breaking strength of the interleaving paper for glass sheets of the present invention is 1.4kPa · m in order to provide JIS P8112 2 Preferably, the wood pulp is mixed with fine cellulose fibers such as cellulose nanofibers. The strength of the interleaving paper for glass sheets of the present invention in the direction perpendicular to the paper surface can be enhanced by mixing the fine cellulose fibers.
In addition, wood pulp and non-wood pulp such as hemp, bamboo, straw, paper mulberry, kapok, etc. can be used alone or in combination as required; modified pulp such as cationized pulp and mercerized pulp; synthetic fibers such as rayon, vinylon, nylon, acrylic, and polyester, and chemical fibers.
However, if the pulp contains a large amount of resin components, there is a possibility that the resin components will contaminate the surface of the glass plate, and therefore, it is preferable to use chemical pulp, for example, softwood bleached kraft pulp, having as little resin components as possible alone as wood pulp.
Further, since the waste paper pulp obtained from waste paper also contains a large amount of resin components derived from ink and the like, it is preferable that wood pulp does not contain waste paper pulp. Further, high-yield pulp such as ground wood pulp is not preferable because it contains a large amount of resin components. Further, if synthetic fibers or chemical fibers are blended, the machinability is improved, and the workability when making a slip sheet into a flat plate is improved, but the recyclability is deteriorated in terms of waste disposal, and thus attention is required.
Further, the specific breaking strength of the interleaving paper for glass sheets of the present invention is 1.4kPa · m in order to provide JIS P8112 2 Preferably, no synthetic or chemical fibers are used.
Wood pulp can be produced from wood chips as a raw material by a common wood pulp production method including a cooking step, a refining/washing step, a bleaching step, and the like.
The form of the wood pulp is not particularly limited, and any form of a sheet, a block or a sheet can be used. The sheet pulp can be obtained, for example, by using a pulp machine including 4 steps of a wire section, a press section, a dryer section, and a finishing section. The pulp fibers are made into paper using a fourdrinier wire, a vacuum filter, or the like in the wire section, and dewatered using a roll press in the press section. In the drying section, drying is performed by a drum dryer, a hot air dryer, or the like, and finally both ends of the sheet-like pulp are cut off and wound on a roll. This method is described in detail in "series of pulp manufacturing techniques" and "book of pulp manufacturing techniques" published by the pulp technology association. The lump pulp can be obtained by stacking the sheet pulp, for example, and the sheet pulp can be obtained by crushing the sheet pulp, for example.
The thickness of the sheet-like pulp is preferably 0.7 to 1.5mm, more preferably 0.9 to 1.3mm, and still more preferably 0 to 1.2mm.
The grammage of the sheet pulp is preferably 400 to 1300g/m 2 More preferably 500 to 1200g/m 2 More preferably 500 to 1100g/m 2 More preferably 500 to 1000g/m 2 More preferably 700 to 1000g/m 2 。
The interleaving paper for glass sheets of the present invention can be obtained by a general papermaking method using, for example, wood pulp. As the paper machine, a known fourdrinier paper machine, a cylinder paper machine, a short wire paper machine, a combined fourdrinier and cylinder paper machine, and the like can be used.
The interleaving paper for glass plates of the present invention is produced by a method including at least a pulp preparation step of preparing a pulp slurry, a sheet forming step of forming the slurry into a sheet, a wet paper preparation step of dewatering the sheet to form a wet paper, and a drying step of drying the wet paper to obtain the interleaving paper.
In the pulp preparation step, a pulp of wood pulp can be prepared by a conventionally known method. For example, in the pulp preparation step, cellulose fibers constituting wood pulp are macerated to prepare an aqueous suspension of the pulp.
The specific breaking strength of the interleaving paper for glass sheets of the present invention is 1.4kPa · m in order to provide JIS P8112 2 (iv) g or more, it is preferable to pulp the wood pulp in the pulp preparation step.
When pulping wood pulp in the production of pulp, the effect of increasing entanglement of cellulose fibers and increasing strength between paper layers can be expected. However, since beating is performed, paper dust may be generated in the process of being used as interleaving paper, and it is not preferable to increase the beating degree more than necessary. Therefore, the freeness is preferably 100 to 600mlcsf, more preferably 200 to 600mlcsf, still more preferably more than 300 to 600mlcsf, and still more preferably more than 300 to 450mlcsf.
The beater used for beating is not particularly limited, and a cone refiner, a drum refiner, a disc refiner, and the like, which are generally used, can be used. In beating, it is preferable to fibrillate the wood pulp so as not to be cut short as much as possible. Therefore, a double disc refiner is preferred. In addition, by adjusting the plate pattern, desired cutting, wet beating, and the like can be performed.
In addition, various additives such as a binder, a mold inhibitor, various papermaking fillers, a wet paper strength enhancer, a dry paper strength enhancer, a sizing agent, a coloring agent, a fixing agent, a yield improver, and a sticky control agent may be added to the slurry as necessary within a range not to impair the performance of the present invention. When these chemicals are added, it is preferable to take care not to mix insects, garbage, and the like.
The specific breaking strength of the interleaving paper for glass sheets of the present invention is 1.4kPa · m in order to provide JIS P8112 2 More than g, preferably adding paper strength enhancer.
In the sheet forming step of forming the slurry into a sheet, the sheet can be formed by a conventionally known method. For example, a sheet can be obtained by discharging the slurry onto a flat wire (for example, a fourdrinier wire), or by taking a sheet from the slurry with a wire wound around a cylindrical cylinder (for example, a cylinder machine).
In the wet paper web production step of dewatering the sheet to form a wet paper web, the dewatering method is arbitrary, and conventionally known methods can be used. For example, the dewatering can be performed by pressing the sheet with a roller. Further, the sheet may be sucked and dewatered. In particular, in order to increase the specific rupture strength, it is preferable to adjust the rolling pressure or the smoothing pressure to be increased.
The sheet forming step and the wet paper making step may be performed separately using different apparatuses, or may be performed continuously or partially repeatedly in the same apparatus. For example, in the wire section of a paper machine, the slurry may be placed on a wire to be made into a sheet and dewatered to form a wet paper.
In the drying step, the interleaving paper can be obtained by drying a wet paper web by a conventionally known method using a drying roll or the like.
Further, the sheet lining paper for glass plates may be subjected to processing such as calendering, supercalendering, soft nip calendering, embossing, and creping during and/or after the paper making process. By these processes, the surface properties or thickness can be adjusted.
The specific breaking strength of the interleaving paper for glass sheets of the present invention is 1.4kPa · m in order to provide JIS P8112 2 The embossing treatment and the creping treatment are preferably performed in terms of the amount of the particles/g or more. By performing these treatments, the interleaving paper for glass plates is easily stretched, and the strength in the direction perpendicular to the paper surface is increased.
For example, minute irregularities can be formed on the surface of the interleaving paper for glass plates by embossing. The height difference of the unevenness is preferably 0.1mm or less.
In addition, in the corrugation process, a three-dimensional corrugation pattern can be formed on the surface of the interleaving paper for glass plates. The wrinkling rate is preferably 5 to 25%.
Further, pinholes may be formed to penetrate the front and back surfaces of the interleaving paper for glass sheets. The diameter of the pinhole may be set to 0.01 to 1mm, for example.
By performing embossing, corrugation, pinhole processing, or the like, the contact area with the glass is reduced, the adhesion strength is reduced, and the interleaving paper can be easily peeled from the glass. Further, since the embossing and the creping process can provide cushion properties to the interleaving paper itself, there is an effect of preventing damage to the glass surface.
The thickness of the interleaving paper for glass sheets of the present invention is preferably 20 to 200. Mu.m, more preferably 30 to 150. Mu.m, and still more preferably 40 to 100. Mu.m.
The grammage of the interleaving paper for glass sheets of the present invention is preferably 20 to 100g/m 2 More preferably 25 to 80g/m 2 More preferably 30 to 70g/m 2 。
As described above, the specific bursting strength of the slip sheet for glass sheets of the present invention, which is defined in JIS P8112, can be set to 1.4kPa · m by adjusting the composition and freeness of the raw wood pulp, selecting the pulper, selecting the pulp additive, and treating the paper surface, alone or in appropriate combination 2 More than g.
The interleaving paper for glass sheets of the present invention may have a plurality of layers or may be composed of a single layer. The multilayer paper may be provided with a single or multiple paper layers and a single or multiple cover layers. The type of the cover layer is not particularly limited, and may be, for example, a resin layer containing a water-soluble resin. Examples of the water-soluble resin include starches such as oxidized starch, esterified starch, etherified starch and dextrin, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, and polyvinyl alcohols. On the other hand, a form having a single layer has a single paper layer. The interleaving paper for glass sheets of the present invention is preferably composed of a single layer. That is, the interleaving paper for glass sheets of the present invention is preferably a single layer.
The lining paper for glass sheets of the present invention may contain short fibers having a fiber length of 200 μm or less, but the short fibers may serve as a paper powder source and may attract foreign matter that damages or contaminates the surface of the glass sheet, and therefore the content of the short fibers is preferably limited.
The content of short fibers having a fiber length of 200 μm or less in the interleaving paper for glass sheets of the present invention is preferably 10.5 wt% or less, more preferably 10.0 wt% or less, further preferably 9.5 wt% or less, and particularly preferably 9.0 wt% or less, based on the oven-dried mass of the interleaving paper. Here, "fiber length" does not mean an average fiber length. Therefore, all of the short fibers having a fiber length of 200 μm or less have a fiber length of 200 μm or less. In other words, the maximum fiber length of the short fibers is 200 μm or less. The fiber length is the length of the fiber in a state where the fiber is straightened.
In the present invention, "oven-dried" means a state in which substantially no moisture is present in the object to be dried by drying.
The average fiber diameter of the short fibers is preferably 10 to 50 μm, more preferably 12 to 40 μm, and still more preferably 15 to 30 μm. The "average fiber diameter" herein means an average fiber diameter obtained by observing a plurality of portions on the surface of the glass plate lining paper under an electron microscope, randomly selecting a predetermined number of fibers from each electron microscope image, measuring the diameters of the selected fibers, and averaging the diameters. The number of fibers to be selected is 100 or more, preferably 150 or more, more preferably 200 or more, and further preferably 300 or more.
The amount of the short fibers present on the surface of the interleaving paper for glass sheets of the present invention is preferably 300 to 850 short fibers/cm 2 More preferably 330 to 800 roots/cm 2 More preferably 350 to 750 roots/cm 2 . If the short fibers are present in a small amount, the amount of foreign matter attracted to the short fibers can be reduced.
In the interleaving paper for glass sheets of the present invention, the difference between the amount of short fibers present on one surface and the amount of short fibers present on the other surface is preferably 15% or less, more preferably 12% or less, and still more preferably 10% or less of the amount of short fibers present on the other surface. That is, in the interleaving paper for glass sheets of the present invention, it is preferable that the amount of short fibers present on one surface does not vary greatly from the amount of short fibers present on the other surface to such an extent that they fall within the specific range described above. The "amount of the short fibers" is the number of the short fibers per unit area on the surface of the interleaving paper, and can be determined by observing a plurality of portions on the surface of the interleaving paper for glass plates under magnification with an electron microscope, and averaging the number of the short fibers observed at the portions per unit area. The number of short fibers of 200 μm or less per unit area can be determined by rubbing a predetermined area with a sheet or the like while the surface of the backing paper is directed downward, and obtaining the number of short fibers per unit area from the falling fibers. Further, the thickness of the base paper can be determined by dividing the base paper into 2 parts at the center in the thickness direction to make 2 very thin sheets, pulping each sheet, and measuring the number of short fibers of 200 μm or less in the pulp. Alternatively, as another method, the surface of the interleaving paper for glass plates having a predetermined area may be sufficiently washed with water, and the amount of short fibers may be determined by supplying the dropped fibers to a fiber length measuring machine.
The moisture content of the interleaving paper for glass sheets of the present invention is preferably 2 to 10 mass%, more preferably 3 to 9 mass%, and still more preferably 4 to 8 mass%. When the water content is less than 2 mass%, the glass lining paper itself is liable to be electrostatically charged, and a blocking phenomenon due to static electricity occurs between the glass plate, which is not preferable. If the water content exceeds 10 mass%, the glass sheet may be stuck due to excessive water content or the water content may decrease during use, resulting in poor dimensional stability.
The surface resistance value of the interleaving paper for glass sheets of the present invention (measured according to JIS K6911 1995) is preferably 1X 10 when the interleaving paper is subjected to humidity conditioning for 24 hours or more under the conditions of a temperature of 23 ℃ and a relative humidity of 50% and then measured under the same conditions 8 ～1×10 13 Omega, more preferably 5X 10 8 ～5×10 12 Omega, more preferably 1X 10 9 ～1×10 12 In the range of Ω. Surface resistance value less than 1 x 10 8 In Ω, the adhesion between the glass plate and the interleaving paper is reduced, and thus the workability may be deteriorated. Further, the surface resistance value is less than 1 x 10 8 The term "Ω" means that more water and a conductive substance (e.g., a surfactant) are added than necessary. Excessive moisture may adversely affect the dimensional stability of the glass lining paper, and since most of the conductive materials are organic, these materials may migrate to the surface of the glass sheet in contact with the surface and cause problems such as contamination. On the other hand, if the surface resistance value of the interleaving paper for glass plate is more than 1X 10 13 A high resistance value such as Ω tends to cause static electricity, and the interleaving paper is in close contact with the surface of the glass plate, which may significantly hinder the workability. As a method of adjusting the surface resistance value to a desired range, for example, adjustment of moisture by drying or the like is exemplified.
The interleaving paper for glass sheets of the present invention is used by being inserted between glass sheets. For example, the interleaving paper for glass sheets of the present invention is typically inserted between a plurality of glass sheets one by one to form a laminate as a whole, and the laminate is an object to be stored and transported. Further, the glass plate alone or the laminate may be packaged using the interleaving paper for glass plates of the present invention.
The glass plate is not particularly limited, but is preferably a glass plate for flat panel displays such as a plasma display panel, a liquid crystal display panel (particularly, a TFT liquid crystal display panel), and an organic EL display panel. Although the minute electrodes, partition walls, color filters, and the like are formed on the surface of the glass plate for a flat panel display, transfer of paper dust to the glass plate can be suppressed by using the interleaving paper for a glass plate of the present invention, and therefore, even if the minute electrodes, partition walls, color filters, and the like are formed on the surface of the glass plate, defects caused by the paper dust can be suppressed or avoided, and as a result, defects in the display can be suppressed or avoided.
In particular, the size and weight of a glass plate for a flat panel display increase with the increase in size of the display, but the interleaving paper for a glass plate according to the present invention can protect the surface of such a large and heavy glass plate satisfactorily. In particular, the slip sheet for glass plates according to the present invention is extremely small in the generation of paper dust, and therefore, even if it is pressed by a heavy glass plate, the transfer of paper dust to the glass plate can be suppressed or avoided. Therefore, the interleaving paper for glass plates of the present invention can be suitably used for glass plates for flat panel displays, which require surface cleaning in particular.
The interleaving paper for glass plates of the present invention can be used in a clean room because the generation of paper dust can be well suppressed.
The surface of the interleaving paper for glass plates of the present invention is very clean, so that no so-called burn marks or paper marks (patterns) are formed on the surface of the glass plates in contact with the interleaving paper, and no damage which causes a problem is caused on the surface of the glass plates in contact with the interleaving paper.
The interleaving paper for glass sheets of the present invention preferably prevents or even avoids foreign matter other than paper powder from being transferred to the surface of the glass sheet.
Examples of the foreign matter include various inorganic substances and organic substances.
Examples of the inorganic substance include inorganic particles having a mohs hardness of 4 or more. Examples of the inorganic particles include metal oxides and inorganic silicon oxides having a mohs hardness of 4 or more. The metal constituting the metal oxide is not particularly limited as long as the oxide has a mohs hardness of 4 or more, and examples thereof include an element of a group 2 element such as magnesium, a group 4 element such as titanium, and a group 8 element such as iron. As the inorganic silicon oxide, silicon dioxide is preferable. Examples of the inorganic particles having a mohs hardness of 4 or more include oxidized minerals. The inorganic particles having a mohs hardness of 4 or more include iron oxide, copper, quartz, fused silica (quartz glass), titanium oxide, glass flakes, quartz pieces, magnesium oxide, sand, and the like. The sand mainly comprises amphibole with Mohs hardness of 5.5, feldspar with Mohs hardness of 6 and quartz with Mohs hardness of 7. Thus, the mohs hardness of the sand is greater than or equal to 4, typically 7. The mohs hardness is a value in which an index of hardness is expressed in 10 ranks, and the corresponding standard substance and a measured substance are rubbed together to relatively evaluate the hardness with respect to the size of the standard substance according to whether or not damage is generated. In order from soft (mohs hardness 1) to hard (mohs hardness 10), the standard substances are as follows: 1: talc, 2: gypsum, 3: calcite, 4: fluorite, 5: apatite, 6: feldspar, 7: quartz, 8: topaz, 9: corundum, 10: diamond. The Mohs hardness was measured by preparing 2 plates having a known Mohs hardness and smooth surfaces, sandwiching a foreign material to be measured between the 2 plates, and rubbing the two plates to examine whether or not the surfaces of the plates were damaged.
Further, the inorganic substance may be an aluminum-based inorganic compound. The aluminum-based inorganic compound herein refers to any inorganic compound containing aluminum as an element. The aluminum-based inorganic compound contains aluminum element and is in a solid state. The term "solid" as used herein means that the solid is in a state of ordinary pressure (1 atm) and ordinary temperature (25 ℃). Therefore, the melting point of the solid aluminum-based inorganic compound exceeds 25 ℃, and is preferably 50 ℃ or higher, more preferably 80 ℃ or higher, and still more preferably 100 ℃ or higher. The solid aluminum-based inorganic compound preferably has a mohs hardness of 4 or more. The solid aluminum-based inorganic compound is not limited in kind, and preferably contains at least one selected from the group consisting of aluminum hydroxide, aluminum oxide, aluminum sulfate and aluminum silicate.
Further, as the inorganic substance, talc may be mentioned. Talc is called "hydrous magnesium silicate" and may be represented by the formula 4SiO 2 ·3MgO·H 2 And O represents. The chemical components are slightly different due to different production places, and the theoretical value is SiO 2 64.4%, 31.8% MgO and 4.7% loss on ignition (moisture). Talc is also known as talc. The average particle diameter of the talc is not particularly limited, but is preferably 1 to 10 μm, more preferably 1 to 8 μm, still more preferably 1 to 6 μm, and particularly preferably 1 to 4 μm. The average particle size may be a volume average particle size, and may be measured by a laser diffraction scattering method, for example. The surface area of the talc is not particularly limited, and the specific surface area measured by the BET method is preferably 1m 2 A value of at least 10 m/g, more preferably 2 A total of 20m or more, preferably 2 More than g. The density of the talc is not particularly limited, but the apparent density is preferably 1g/ml or less according to JIS K5101,more preferably 0.8g/ml or less, still more preferably 0.6g/ml or less, yet more preferably 0.4g/ml or less, and yet more preferably 0.2g/ml or less.
Examples of the organic substance include silicone. Examples of the silicone include silicone oil. The silicone oil is hydrophobic, and the molecular structure thereof may be any of cyclic, linear, and branched. The kinematic viscosity of the silicone oil at 25 ℃ is generally between 0.65 and 100,000 mm 2 The thickness of the film may be in the range of 0.65 to 10,000 mm 2 (ii) a range of/s.
Examples of the silicone oil include linear organopolysiloxanes, cyclic organopolysiloxanes, and branched organopolysiloxanes. The silicone oil is preferably dimethyl polysiloxane, diethyl polysiloxane, methylphenyl polysiloxane, polydimethyl-polydiphenylsiloxane copolymer, polymethyl-3,3,3-trifluoropropylsiloxane, or the like. As the silicone, dimethylpolysiloxane is typical. The silicone content in the interleaving paper for glass sheets of the present invention is preferably 0.5ppm or less, more preferably 0.4ppm or less, more preferably 0.3ppm or less, more preferably 0.2ppm or less, and particularly preferably 1ppm or less, based on the oven-dried mass of the interleaving paper.
The present invention also relates to a method for suppressing the specific breaking strength of a slip sheet for glass plates, which is defined in JIS P8112, from being 1.4kPa · m 2 A method for producing paper powder on the lining paper for glass plate above.
It has not been clarified until the present invention that paper dust is generated on the paper surface by an external force generated by various rollers and the like used in the paper feeding operation when the paper feeding operation for inserting the interleaving paper between the glass plates is performed, and that the specific breaking strength of the interleaving paper for glass plates and the generation of the paper dust have an inverse correlation. Further, the specific breaking strength of the interleaving paper for glass plates, which is defined in JIS P8112, was set to 1.4kPa · m 2 It was not clear before the present invention that the generation of paper dust can be suppressed well above/g. The invention provides a novel method for inhibiting paper powder generation of interleaving paper for glass plates.
The above description of the interleaving paper for glass sheets of the present invention is directly applicable to the interleaving paper for glass sheets of the present invention, the specific breaking strength, and the like of the method for suppressing generation of paper dust of the present invention. For example, the glass-sheet interleaving paper is preferably made of wood pulp, and more preferably, the wood pulp does not contain waste paper pulp. The interleaving paper for glass sheets is preferably a single layer.
The method for suppressing the generation of paper dust of the present invention can be suitably used for glass plates for flat panel displays such as plasma display panels, liquid crystal display panels (particularly TFT liquid crystal display panels), organic EL display panels, and the like, which require surface cleaning properties in particular.
[ examples ] A method for producing a compound
The present invention will be described in more detail below with reference to examples and comparative examples, but the scope of the present invention is not limited to the examples.
[ example 1]
100 parts by mass of bleached softwood kraft pulp (NBKP) as wood pulp was digested to prepare a pulp slurry having a freeness of 600mlc.s.f., and a grammage of 50g/m was prepared using a fourdrinier machine 2 The interleaving paper for glass sheets of (1). As paper making conditions, the roll pressures in the press sections were set to 40kg/cm for the 1 st press, 65kg/cm for the 2 nd press and 90kg/cm for the 3 rd press. Further, the smoothing press pressure was set to 40kg/cm.
[ example 2]
A grammage of 50g/m was determined in the same manner as in example 1 except that the pulp prepared in example 1 was used as a pulp, except that a polyamide epichlorohydrin-based paper strength agent (trade name: WS4020, manufactured by Star photo PMC) was blended in an amount of 0.4 parts by mass based on 100 parts by mass of NBKP contained in the pulp 2 The interleaving paper for glass sheets of (1).
[ example 3]
A grammage of 50g/m was produced in the same manner as in example 1, except that the freeness of the pulp slurry was 420mlc.s.f., and the roll pressures of the press sections were set to 50kg/cm for the 1 st press, 80kg/cm for the 2 nd press, and 100kg/cm for the 3 rd press 2 The interleaving paper for glass sheets of (1).
[ example 4]
NBKP was dispersed in water to 2 mass%, and the resulting dispersion was pulped with a double disc refiner until the average fiber length became 400 μm, and then treated 6 times with a high pressure homogenizer (SMT, LAB 1000) adjusted to a pressure of 750bar, thereby obtaining cellulose nanofibers.
A basis weight of 50g/m was obtained in the same manner as in example 1, except that 5 parts by mass of the cellulose nanofibers and 0.4 part by mass of a paper strength agent polyacrylamide (trade name: polyston 1254, manufactured by Mikawa chemical industries, ltd.) were mixed with 100 parts by mass of NBKP contained in the pulp slurry prepared in example 1 2 The interleaving paper for glass sheets of (1).
Comparative example 1
A grammage of 50g/m was obtained in the same manner as in example 1, except that the roll pressures in the press sections were set to 30kg/cm for the 1 st press, 55kg/cm for the 2 nd press and 80kg/cm for the 3 rd press 2 The interleaving paper for glass sheets of (1).
Comparative example 2
A grammage of 50g/m was obtained in the same manner as in example 1, except that the pulp slurry prepared in example 1 was mixed with 20 parts by mass of polyethylene terephthalate fibers (cut fiber length 3 mm) per 100 parts by mass of NBKP contained in the pulp slurry, and a fourdrinier wire papermaking machine was used 2 The interleaving paper for glass sheets of (1).
[ specific rupture Strength ]
The specific breaking strength of the interleaving papers for glass sheets of examples 1 to 4 and comparative examples 1 to 2 was measured in accordance with JIS P8112.
[ abrasion test ]
The interleaving papers for glass plates of examples 1 to 4 and comparative examples 1 to 2 were subjected to abrasion test. The abrasion test was performed using a test method based on JIS P8136:1994 (Xiong Guli machine industries, ltd.), a 500gf load was applied to 1 set of glass plate-use backing paper, and the paper was slid back and forth at a speed of 30 reciprocations per minute to rub the front and back surfaces of the paper into contact with each other. The peeling of the paper from the surface of the interleaving paper for glass plates and the generation of paper dust on the surface of the paper after the sliding times of 5 times were visually confirmed, and the evaluation was performed according to the following criteria.
Very good: no paper peeling and no paper dust generation
O: no paper peeling occurred, but a small amount of paper dust was generated
X: paper peeling occurs and paper dust is generated (there is a case where breakage occurs with paper peeling)
The results are shown in Table 1.
[ TABLE 1]
Figure BDA0003856374080000131
Figure BDA0003856374080000141

Claims (15)

1. A lining paper for glass plates, which has a specific breaking strength of 1.4kPa · m as specified in JIS P8112 2 More than g.
2. The interleaving paper for glass sheets as claimed in claim 1, which is made of wood pulp.
3. The interleaving paper for glass sheets as claimed in claim 2, wherein the wood pulp does not contain waste pulp.
4. The interleaving paper for glass sheets as claimed in any one of claims 1 to 3, which is a single layer.
5. The interleaving paper for glass plates according to any one of claims 1 to 4, wherein the glass plate is used for a display.
6. The interleaving paper for glass plates according to claim 5, wherein the display is a TFT liquid crystal display or an organic EL display.
7. The interleaving paper for glass plates according to claim 6, wherein a color filter is formed on a surface of the glass plate.
8. A laminate comprising the interleaving paper for glass sheets as defined in any one of claims 1 to 7 and a glass sheet.
9. A method for suppressing the generation of paper dust in a glass plate lining paper having a specific breaking strength of 1.4kPa m as defined in JIS P8112 2 More than g.
10. The method of claim 9, wherein the glass sheet lining paper is wood pulp.
11. The method of claim 10 wherein the wood pulp is free of waste pulp.
12. The method according to any one of claims 9 to 11, wherein the slip sheet for glass sheets is a single layer.
13. The method of any of claims 9-12, wherein the glass sheet is used in a display.
14. The method of claim 13, wherein the display is a TFT liquid crystal display or an organic EL display.
15. The method of claim 14, wherein a color filter is formed on a surface of the glass plate.
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